Tool



Oct. 20, 1942. P. R. GJERTSEN 2,299,226

' TOOL Filed June 13, 1940 Patented Oct. 20, 1942 TOOL Paul l.. Gjertsen, Detroit, Mieli.. assigner to Ex- Cell-O Corporation, Detroit, Mich., a corporation of Michigan Application June 18, 1940, Serial No. 340,309

1 Claim.

The invention relates to a tool, and more particularly to a lapping or honing tool for use in nnishing the inner surface of cylindrical members, and the subject matter of this invention is a continuation-inpart et my copending application Serial No. 188,593, led February 4. 1938.

An object of the invention is to provide a new and improved tool having axially movable abrasive members associated with means operable as an incident to the axial movement of said members to move them radially to vary the outside diameter of the abrasive surface.

Another object of the invention is to provide a new and improved tool embodying a plurality of abrasive elements slidable longitudinally along tapered surfaces to eect a radial adjustment for varying the outside diameter of the working surface of the abrasive members.

Further objects of the invention are to provide a new and improved tool embodying, among other features, a novel form oi abrading element and a novel form oi.' supporting means for the abrading element, the element and the supporting means being arranged to be bonded together and the abrading unit thus formed being fashioned ior operative association with coacting tapered surfaces.

Other objects and advantages of the invention will become apparent in the following description and from the accomplnylns drawing, in which:

Figure 1 is a side elevational view of a tool embodying the features of the invention, parts being broken away and in section.

' ment adapted to be inserted in a suitable chuck Il'lg. 2 is atransverse sectional view through the tool on the line 2 2 ofng. l.

Fig. 3 is a transverse sectional view on the line 3 3 o! Fig. 1.

While the invention is susceptible ot various modidcations and alternative constructions. I have shown in the drawing and will herein describe in detail the preferred embodiment, but it is to be understood that I do not thereby intend to limit the invention to the speciilc form'disclosed, but intend to cover all modications and alternative constructions falling within the spirit and scope oi the invention as expressed in the appended claim.

Referring to the drawing, the tool inthe exemplary form which has been selected for illustrative purposes. includes a shank, mandrel or or the like.

The opposite end of the shank Il has an end portion arranged to be operatively engaged by the abrading unit. Thus, as shown in Fig. 1, diametrically opposite end portions of the shank are cut away to provide a thin plate Il presenting substantially nat opposed faces. 'Ihe plate is located approxlmately on the diameter of the shank andopposite side edges thereof are tapered, as at I., with respect to the axis of the shank, and the tapered edges substantially meet on the axis of the shank at the extreme end thereof.

Carrier members or holders 2! for the abrasive elements are arranged for operative engagement with one of the tapered side edges 2l of the plate Il. Each carrier is nat, is preferably formed of sheet metal, and has a longitudinal medial portion thereof bent to provide a rib 24 of U-shaped cross section lprojecting beyond one face of the holder. 0n the opposite face, the bent portion provides a groove 2l which is dimensioned snugly to embrace a tapered edge portion of the plate Il. The rib and the groove 2l are of gradually increasing height or depth. respectively, from one end of the holder to the other and the angularity oi the base oi' the groove is complemental to l snug iit between the holder and the abrasive element. These parts are bonded together in any suitable manner.

As may be seen in Fig. 1, the holder is somewhat longer than the abrasive element bonded '4u thereto and in assembly the end of the holder,

at which the dimension of the rib is the greatest, extent beyond the abrasive element. An elongated rod Il is secured at one end to a projected part ot the holder. for instance to the rib (as shown). Grooves 8l are formed diametricaily on the shank to extend longitudinally thereof subedle b! the Plate.

arbor l2 having one end thereof arranged to be operatively connected with a rotatable driving spindle or the like. 4 stance,theendoftheshankisscrewthreaded,as

Thus, in the present in.

staatially on ile plane of the plate I8. Each of these grooves receives the rod 32 on the holder associated with the corresponding tapered side The rods preferably do not poiect beyond the outer periphery of the shank :meneeendsoftherodsarebentatruht angles, as indicated at Il, to provide short ends at il, to engage a socket it constituting an elethat. in wmbly with the Shank, extend outwardly and radially therefrom. A nut or collar 3l having external screw threaded engagement with the end of the socket has a radial flange 40. A disk 42, screw threaded into the nut or collar 3l, is arranged to bind the ends 36 on the rods against the flange Il on the nut. Adjustment of the nut 3l relative to the socket I6 will effect an t axial movement which, through the rods 32, will `move the abrasive units in an axial direction along the plate I8. This movement will, because ed to a holder, are operatively assembled on the tapered plate of the shank.

Cross reference is hereby made to my copendl ing application Serial No. 264,706, filed March 29,

\ 1939, and matured as Patent No. 2,268,479, De-

` cember 20, i941, which covers the subject matter of invention generic to the two cases.

I claim as my invention:b

In a tool of the class described, in combination, a shank having at one end thereof an axially extending diametrical blade, said blade having its edges of uniform angularity with respect to the axis of said shank to provide tapering edges that meet substantially on the axis of said shank, a sheet metal holder medlally and longitudinally bent to provide a U-shaped groove arranged snugly to ilt upon a side edge of said blade and relatively wide side portions extending laterally outwardly from each side of said groove, said groovebeing of gradually diminishing depth from one end of said holder to the other to provide a groove having a base complemental to the angie of a side edge of said blade, an abrading element of substantially uniform semi-circular cross sectional area bonded to said holder and having a medial longitudinal recess to receive the bent portion of said holder and nat side faces to abut the wide side portions of said holder, and means connected to said holder for shifting said holder and abrading element along said shank. y 

